As you know, CONFIG_CPU_FREQ_S3C24XX_IODEBUG is for enabling ofs3c_freq_iodbg() and there is no problem when CONFIG_S3C241{0,2}_IOTIMING isnot selected, even though s3c_freq_iodbg() is used only ats3c2410-iotiming.c now. So this is not necessary to fix the problem yousaid.